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Title: Advances in boronization on NSTX-Upgrade

Abstract

Boronization has been effective in reducing plasma impurities and enabling access to higher density, higher confinement plasmas in many magnetic fusion devices. The National Spherical Torus eXperiment, NSTX, has recently undergone a major upgrade to NSTX-U in order to develop the physics basis for a ST-based Fusion Nuclear Science Facility (FNSF) with capability for double the toroidal field, plasma current, and NBI heating power and increased pulse duration from 1–1.5 s to 5–8 s. A new deuterated tri-methyl boron conditioning system was implemented together with a novel surface analysis diagnostic. We report on the spatial distribution of the boron deposition versus discharge pressure, gas injection and electrode location. The oxygen concentration of the plasma facing surface was measured by in-vacuo XPS and increased both with plasma exposure and with exposure to trace residual gases. This increase correlated with the rise of oxygen emission from the plasma.

Authors:
; ; ; ; ; ORCiD logo ; ;
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
DOE Contract Number:  
AC02-09CH11466
Product Type:
Dataset
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Boronization Deuterated tri-methyl boron NSTX-U Plasma-materials interaction Surface analysis
Keywords:
Boronization Deuterated tri-methyl boron NSTX-U Plasma-materials interaction Surface analysis
OSTI Identifier:
1367555
DOI:
10.11578/1367555

Citation Formats

Skinner, C.H., Bedoya, F., Scotti, F., Allain, J.P., Blanchard, W., Cai, D., Jaworski, M., and Koel, B.E. Advances in boronization on NSTX-Upgrade. United States: N. p., 2017. Web. doi:10.11578/1367555.
Skinner, C.H., Bedoya, F., Scotti, F., Allain, J.P., Blanchard, W., Cai, D., Jaworski, M., & Koel, B.E. Advances in boronization on NSTX-Upgrade. United States. doi:10.11578/1367555.
Skinner, C.H., Bedoya, F., Scotti, F., Allain, J.P., Blanchard, W., Cai, D., Jaworski, M., and Koel, B.E. 2017. "Advances in boronization on NSTX-Upgrade". United States. doi:10.11578/1367555. https://www.osti.gov/servlets/purl/1367555. Pub date:Sun Jan 01 00:00:00 EST 2017
@article{osti_1367555,
title = {Advances in boronization on NSTX-Upgrade},
author = {Skinner, C.H. and Bedoya, F. and Scotti, F. and Allain, J.P. and Blanchard, W. and Cai, D. and Jaworski, M. and Koel, B.E.},
abstractNote = {Boronization has been effective in reducing plasma impurities and enabling access to higher density, higher confinement plasmas in many magnetic fusion devices. The National Spherical Torus eXperiment, NSTX, has recently undergone a major upgrade to NSTX-U in order to develop the physics basis for a ST-based Fusion Nuclear Science Facility (FNSF) with capability for double the toroidal field, plasma current, and NBI heating power and increased pulse duration from 1–1.5 s to 5–8 s. A new deuterated tri-methyl boron conditioning system was implemented together with a novel surface analysis diagnostic. We report on the spatial distribution of the boron deposition versus discharge pressure, gas injection and electrode location. The oxygen concentration of the plasma facing surface was measured by in-vacuo XPS and increased both with plasma exposure and with exposure to trace residual gases. This increase correlated with the rise of oxygen emission from the plasma.},
doi = {10.11578/1367555},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {1}
}

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